Two-bolt saddle clamp piece?

I purchased an older frame over the winter ('03 QR Caliente) with a seat post that apparently attaches the saddle via two bolts that squeeze together upper and lower clamp pieces on the saddle rails.

It is like figure 13.8 in “Zinn & The Art of Triathlon Bikes” (though my clamp piece looks more like the 13.7 figure).

That’s the problem: I’m missing one of the other clamp piece (I assume top and lower are identical??)

Any idea where I could obtain a replacement? I’ve searched the net all weekend to no avail…

Many thanks in advance!!

bump because I’m desperate… :frowning:

Any ideas?

Anyone??

Bueller…? Bueller…? Bueller…?

;-(